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 Hu Chunming
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#ifndef BOOST_MPL_COUNT_IF_HPP_INCLUDED
#define BOOST_MPL_COUNT_IF_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2000-2002
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/mpl for documentation.
// $Id$
// $Date$
// $Revision$
#include <boost/mpl/fold.hpp>
#include <boost/mpl/next.hpp>
#include <boost/mpl/integral_c.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/apply.hpp>
#include <boost/mpl/aux_/msvc_eti_base.hpp>
#include <boost/mpl/aux_/na_spec.hpp>
#include <boost/mpl/aux_/lambda_support.hpp>
#include <boost/mpl/aux_/config/forwarding.hpp>
namespace boost { namespace mpl {
namespace aux {
template< typename Predicate >
struct next_if
{
template<
typename N
, typename T
>
struct apply
#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
: eval_if<
typename apply1<Predicate,T>::type
, next<N>
, identity<N>
>
{
#else
{
typedef typename eval_if<
typename apply1<Predicate,T>::type
, next<N>
, identity<N>
>::type type;
#endif
};
};
} // namespace aux
template<
typename BOOST_MPL_AUX_NA_PARAM(Sequence)
, typename BOOST_MPL_AUX_NA_PARAM(Predicate)
>
struct count_if
: aux::msvc_eti_base< typename fold<
Sequence
, integral_c<unsigned long,0>
, protect< aux::next_if<Predicate> >
>::type >
{
BOOST_MPL_AUX_LAMBDA_SUPPORT(2,count_if,(Sequence,Predicate))
};
BOOST_MPL_AUX_NA_SPEC(2, count_if)
}}
#endif // BOOST_MPL_COUNT_IF_HPP_INCLUDED
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